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XFree - free client data
int XFree(void *data);
data Specifies the data that are to be freed.
The XFree function is a general-purpose Xlib routine that frees the specified data. You must use it to free any objects that were allo- cated by Xlib, unless an alternate function is explicitly specified for the object. A NULL pointer cannot be passed to this function.
Xlib - C Language X Interface XFree(3X11)